The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 30, 2010
Filed:
Jan. 31, 2008
Jon A. Loschke, Austin, TX (US);
Timothy A. Olson, Austin, TX (US);
Terrence Matthew Potter, Austin, TX (US);
Jon A. Loschke, Austin, TX (US);
Timothy A. Olson, Austin, TX (US);
Terrence Matthew Potter, Austin, TX (US);
Applied Micro Circuits Corporation, San Diego, CA (US);
Abstract
A system and method are provided for updating a global history prediction record in a microprocessor system using pipelined instruction processing. The method accepts a microprocessor instruction of consecutive operations, including a conditional branch operation with an associated branch address, at a first stage in a pipelined microprocessor execution process. A global history record (GHR) of conditional branch resolutions and predictions is accessed and hashed with the branch address, creating a first hash result. The first hash result is used to access an indexed branch history table (BHT) of branch direction counts and the BHT is used to make a branch prediction. If the branch prediction being 'taken', the current GHR value is left-shifted and hashed with the branch address, creating a second hash result which is used in creating an updated GHR.